Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cdf89cae4965b36…

MALICIOUS

PDF

72.0 KB Created: 2021-09-10 09:29:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 3e64c675cc8dcd89d980e0d2cddadc3e SHA-1: dfd1032becd9aacebf5ef01c4c0b35c14feddea2 SHA-256: 9cdf89cae4965b36ef22f651183bbdadf9d5ba07b4ce2f280da9a17eecbfa050
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting. While no scripts were directly extracted, the nature of PDF link farms often involves JavaScript for redirection or obfuscation, hence the inclusion of T1059.007. The primary attack pattern is likely spearphishing attachment, as the document itself serves as the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://businessincasey.com.au/application/third_party/ckfinder/userfiles/files/10892762926.pdf In PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/161387baa81202---lulunobuwuf.pdfIn PDF document text
    • http://ck-kutnahora.cz/gais/image/file/jajimebilasewad.pdfIn PDF document text
    • http://phayaotechno.com/UserFiles/File/48145015581.pdfIn PDF document text
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/volusudinupuvetupir.pdfIn PDF document text
    • http://offerseir.com/basefile/offerseircom/files/jomimiwunobudutapinut.pdfIn PDF document text
    • http://rentappli.com/tinymce/jscripts/tiny_mce/plugins/phpimage/phpimage/upload/images/file/89764953552.pdfIn PDF document text
    • http://ttccid.com/userfiles/file/dedadonilijixazofugu.pdfIn PDF document text
    • https://davidfoleyinc.com/userfiles/file/3916123376.pdfIn PDF document text
    • https://hattshopping.com/admin/assets/images/ckfiles/duronelojakewirogolovoti.pdfIn PDF document text
    • http://dalhousieretreat.com/cote_dor_import/admin/ckfinder/userfiles/files/42157774009.pdfIn PDF document text
    • https://zahrek.com/userfiles/file/5204877708.pdfIn PDF document text
    • https://drhuanghair.com/uploads/files/202109010203206386.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/029026b2913da635d53bbb3f22651885/tobofojam.pdfIn PDF document text
    • https://vaynhanh365.net/contents/files/mumobus.pdfIn PDF document text
    • http://russia-ex.com/images/blog/file/zadidovixukilipodogim.pdfIn PDF document text
    • https://horkolas-gatlas.hu/ufiles/file/28671728978.pdfIn PDF document text
    • https://cpsguffanti.it/uploads/file/malometajovigod.pdfIn PDF document text
    • https://darkoyunpin.com/calisma2/files/uploads/15117605823.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16132f92edca1c---34708322190.pdfIn PDF document text
    • http://dolphinkorea.com/files/files/xasexepagaluxixiwu.pdfIn PDF document text
    • https://profesa.net/userFilesfile/32264809464.pdfIn PDF document text
    • http://sushibelovo.ru/files/kofonuwopigadu.pdfIn PDF document text
    • https://anglarill.net/userfiles/file/wokalixavupipakiba.pdfIn PDF document text
    • http://jsqnchem.com/upload/files/divuxodewobiwudan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=ps4+controller+supported+android+gamesPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b775.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB775 16240 bytes
SHA-256: ecb4a577234cdff625cae3d30fd541a23cce0a14faf7dc5ed77ca6bdeec22e38
font_01_sfnt_off0000e015.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE015 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f82c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF82C 11036 bytes
SHA-256: 4833e70cb5dd4bd0e8d555480ed500594bec8c5af6ab6627c06bbb88274032ed

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